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While it is almost certainly a hardware issue, the QA department can also try and troubleshoot it from the crash log minidump.
@Carlux Could you please upload the contents of one of the folders within "Documents/Paradox Interactive/Victoria 3/crashes"?
 
I understand, however to nail down what exactly went wrong we need the specified files.

If the game has worked before the system update and the 1.5 patch, you could also try deleting the shader cache folder "C:\Users\yourusername\Documents\Paradox Interactive\Victoria 3\shadercache" and try to run the game again.